powerpc/fsl_booke: Tell map_mem_in_cams() if init is done

In order to be able to call map_mem_in_cams() once more
after init for STRICT_KERNEL_RWX, add an argument.

For now, map_mem_in_cams() is always called only during init.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/3b69a7e0b393b16984ade882a5eae5d727717459.1634292136.git.christophe.leroy@csgroup.eu