powerpc: Refactor permission masks used for __P/__S table and kernel memory flags

Prepare a common version of the permission masks that will be based
on _PAGE_NA, _PAGE_RO, _PAGE_ROX, _PAGE_RW, _PAGE_RWX that will be
defined in platform specific headers in later patches.

Put them in a new header pgtable-masks.h which will be included by
platforms.

And prepare a common version of flags used for mapping kernel memory
that will be based on _PAGE_RO, _PAGE_ROX, _PAGE_RW, _PAGE_RWX that
will be defined in platform specific headers.

Put them in unless _PAGE_KERNEL_RO is already defined so that platform
specific definitions can be dismantled one by one.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/d31b59efcdb38e675479563307af891aeadf6ec9.1695659959.git.christophe.leroy@csgroup.eu

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