[7x30] Update write to PVR2F0 when initializing cache settings

Original code intended to write to PVR2F0 as commented, but was
incorrectly writing to PVR2F2 instead which affects L1 D cache
read timing. Fixing to write to PVR2F0 as was originally intended.

Also adding data and instruction synchronization after zeroing
bss to force context ordering before jumping to kmain.

Change-Id: Ibdfffd5bad33fa7bfe068fb743fec0cbec97ece8
2 files changed