Revert "ARM: 7691/1: mm: kill unused TLB_CAN_READ_FROM_L1_CACHE and use ALT_SMP instead"

This reverts commit 084961da74cd98f784ec589e54e0c68d11d18228.

Conflicts:
	arch/arm/mm/proc-v7-2level.S
	arch/arm/mm/proc-v7-3level.S
	arch/arm/mm/proc-v7.S
Revert "ARM: Use TTBR1 instead of reserved context ID"

This reverts commit 7fb5af1853ff651793f7486d88f0d3fbe0710be0.