powerpc/chrp: Fix enter_rtas() with CONFIG_VMAP_STACK

With CONFIG_VMAP_STACK, data MMU has to be enabled
to read data on the stack.

Fixes: cd08f109 ("powerpc/32s: Enable CONFIG_VMAP_STACK")
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/d2330584f8c42d3039896e2b56f5d39676dc919c.1581669558.git.christophe.leroy@c-s.fr