net: ipa: get rid of ipa->reg_addr

The reg_addr field in the IPA structure is set but never used.
Get rid of it.

Signed-off-by: Alex Elder <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ipa/ipa.h

···
  * @interrupt:		IPA Interrupt information
  * @uc_powered:		true if power is active by proxy for microcontroller
  * @uc_loaded:		true after microcontroller has reported it's ready
- * @reg_addr:		DMA address used for IPA register access
  * @reg_virt:		Virtual address used for IPA register access
  * @regs:		IPA register definitions
  * @mem_addr:		DMA address of IPA-local memory space
···
 	bool uc_powered;
 	bool uc_loaded;
 
-	dma_addr_t reg_addr;
 	void __iomem *reg_virt;
 	const struct ipa_regs *regs;
 

drivers/net/ipa/ipa_reg.c

···
 		dev_err(dev, "unable to remap \"ipa-reg\" memory\n");
 		return -ENOMEM;
 	}
-	ipa->reg_addr = res->start;
 	ipa->regs = regs;
 
 	return 0;