core_mmu_v7: Rename index to normal cached memory
core_mmu_v7: Rename index to normal cached memory

The index into cache attribute registers for device memory is called
ATTR_DEVICE_INDEX, but the normal cached memory is referred to as
ATTR_IWBWA_OWBWA_INDEX, this implies the caching type. This is not
always the type of cache we will use. Rename it to a more generic
ATTR_NORMAL_CACHED_INDEX.

Signed-off-by: Andrew F. Davis <a6dfde0ec5c5124d26ab0cb4f9ab9a758dee1d6f@ti.com>
Reviewed-by: Jens Wiklander <7706914404370d7502c27a0eff493dcf491feb51@linaro.org>

pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os