openrisc: use get_kernel_nofault() in show_registers()

show_registers() dumps the stack and the code around the PC, but only
for a kernel-mode fault, and only after checking that each address is
at or above PAGE_OFFSET.  Both are kernel addresses that may not be
mapped.

It reads them with __get_user(), which predates get_kernel_nofault(),
the interface for exactly this: a kernel address that may not be mapped,
read with page faults disabled.

This is part of getting rid of __get_user() and __put_user() entirely.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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