ARM64: Make KERNEL_TEXT_RDONLY depend on !DEBUG_RODATA

KERNEL_TEXT_RDONLY is similar to DEBUG_RODATA, but it relies on
4k pages to be made, whereas DEBUG_RODATA can work with or
without 4k pages. Let's move the depends on statement from
FORCE_PAGES to KERNEL_TEXT_RDONLY to accurately reflect the real
dependency here. This fixes a warning where we have FORCE_PAGES
enabled but DEBUG_RODATA is also enabled at the same time because
the latter is "default y" now and the depends on for FORCE_PAGES
can't be satisfied. In fact, it's OK for FORCE_PAGES to be
enabled at the same time as DEBUG_RODATA, it's really there to
prevent KERNEL_TEXT_RDONLY being enabled at the same time as
DEBUG_RODATA. Move the depends on to make things clearer.

Change-Id: Ie73b768ed4540cdb4d752a9b5f1a049bf644bc7e
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>