arm: mm: lpae clear mmu table when initialization
arm: mm: lpae clear mmu table when initialization

Clear the tables when initialization to avoid junk data which
may crash system when setting ttbrx.

To ARMv7, non-lpae, this commit 'bc4de3134468a4b1760e6fd5cf09377bf7a7e7c3'
fix an issue when setting ttbr0 which crash system, because of junk data
in table.

This patch is to fix such issue.

Signed-off-by: Peng Fan <7351ee4254d3ae583dd8772c904897a231cf4948@gmail.com>
Reviewed-by: Pascal Brand <0b55292d2562685bad4ce52d64f802e8f1cd299e@linaro.org>
Tested-by: Pascal Brand <0b55292d2562685bad4ce52d64f802e8f1cd299e@linaro.org> (QEMU platform)

pascal-brand-st-dev/optee_os,pascal-brand-st-dev/optee_os,chshxi1989/optee_os,pascal-brand-st-dev/optee_os,Microsoft/optee_os,chshxi1989/optee_os,Microsoft/optee_os,chshxi1989/optee_os,matt2048/optee_os,matt2048/optee_os,Microsoft/optee_os,cedric-chaumont-st-dev/optee_os,matt2048/optee_os,chshxi1989/optee_os,Microsoft/optee_os,chshxi1989/optee_os,pascal-brand-st-dev/optee_os,cedric-chaumont-st-dev/optee_os,cedric-chaumont-st-dev/optee_os,matt2048/optee_os,cedric-chaumont-st-dev/optee_os,Microsoft/optee_os,pascal-brand-st-dev/optee_os