dmaengine: sun4i-dma: Demote obvious misuse of kerneldoc to standard comment blocks

No attempt has been made to document any of the demoted functions here.

Fixes the following W=1 kernel build warning(s):

drivers/dma/sun4i-dma.c:321: warning: Function parameter or member 'priv' not described in '__execute_vchan_pending'
drivers/dma/sun4i-dma.c:321: warning: Function parameter or member 'vchan' not described in '__execute_vchan_pending'
drivers/dma/sun4i-dma.c:435: warning: Function parameter or member 'chan' not described in 'generate_ndma_promise'
drivers/dma/sun4i-dma.c:435: warning: Function parameter or member 'src' not described in 'generate_ndma_promise'
drivers/dma/sun4i-dma.c:435: warning: Function parameter or member 'dest' not described in 'generate_ndma_promise'
drivers/dma/sun4i-dma.c:435: warning: Function parameter or member 'len' not described in 'generate_ndma_promise'
drivers/dma/sun4i-dma.c:435: warning: Function parameter or member 'sconfig' not described in 'generate_ndma_promise'
drivers/dma/sun4i-dma.c:435: warning: Function parameter or member 'direction' not described in 'generate_ndma_promise'
drivers/dma/sun4i-dma.c:501: warning: Function parameter or member 'chan' not described in 'generate_ddma_promise'
drivers/dma/sun4i-dma.c:501: warning: Function parameter or member 'src' not described in 'generate_ddma_promise'
drivers/dma/sun4i-dma.c:501: warning: Function parameter or member 'dest' not described in 'generate_ddma_promise'
drivers/dma/sun4i-dma.c:501: warning: Function parameter or member 'len' not described in 'generate_ddma_promise'
drivers/dma/sun4i-dma.c:501: warning: Function parameter or member 'sconfig' not described in 'generate_ddma_promise'
drivers/dma/sun4i-dma.c:577: warning: Function parameter or member 'contract' not described in 'get_next_cyclic_promise'
drivers/dma/sun4i-dma.c:596: warning: Function parameter or member 'vd' not described in 'sun4i_dma_free_contract'

Signed-off-by: Lee Jones <[e-mail]>
Acked-by: Chen-Yu Tsai <[e-mail]>
Cc: Maxime Ripard <[e-mail]>
Cc: Chen-Yu Tsai <[e-mail]>
Cc: "Emilio López" <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Vinod Koul <[e-mail]>

drivers/dma/sun4i-dma.c

···
 	spin_unlock_irqrestore(&priv->lock, flags);
 }
 
-/**
+/*
  * Execute pending operations on a vchan
  *
  * When given a vchan, this function will try to acquire a suitable
···
 	return 0;
 }
 
-/**
+/*
  * Generate a promise, to be used in a normal DMA contract.
  *
  * A NDMA promise contains all the information required to program the
···
 	return NULL;
 }
 
-/**
+/*
  * Generate a promise, to be used in a dedicated DMA contract.
  *
  * A DDMA promise contains all the information required to program the
···
 	return NULL;
 }
 
-/**
+/*
  * Generate a contract
  *
  * Contracts function as DMA descriptors. As our hardware does not support
···
 	return contract;
 }
 
-/**
+/*
  * Get next promise on a cyclic transfer
  *
  * Cyclic contracts contain a series of promises which are executed on a
···
 	return promise;
 }
 
-/**
+/*
  * Free a contract and all its associated promises
  */
 static void sun4i_dma_free_contract(struct virt_dma_desc *vd)