drm/gma500: Remove in_atomic() usage.

The driver is using msleep() if it is safe to use based on in_atomic().
This is not needed this macro is only used from
i2c_algorithm::master_xfer() which is always invoked from preemptible
context.

Remove in_atomic() because it is superfluous. Remove wait_for_atomic()
because it has no users.

Signed-off-by: Sebastian Andrzej Siewior <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/gma500/intel_gmbus.c

···
 			ret__ = -ETIMEDOUT;				\
 			break;						\
 		}							\
-		if (W && !(in_atomic() || in_dbg_master())) msleep(W);	\
+		if (W && !(in_dbg_master()))				\
+			msleep(W);					\
 	}								\
 	ret__;								\
 })
 
 #define wait_for(COND, MS) _wait_for(COND, MS, 1)
-#define wait_for_atomic(COND, MS) _wait_for(COND, MS, 0)
 
 #define GMBUS_REG_READ(reg) ioread32(dev_priv->gmbus_reg + (reg))
 #define GMBUS_REG_WRITE(reg, val) iowrite32((val), dev_priv->gmbus_reg + (reg))