iommu/qcom: Change CONFIG_BIG_ENDIAN to CONFIG_CPU_BIG_ENDIAN

CONFIG_BIG_ENDIAN does not exist as a Kconfig symbol.

Signed-off-by: Joe Perches <joe@perches.com>
Reviewed-by: Rob Clark <robdclark@gmail.com>
Link: https://lore.kernel.org/r/5a663096b489b86472fe3bfbd5138c411d669bad.camel@perches.com


Signed-off-by: Joerg Roedel <jroedel@suse.de>