powerpc/xmon: Use bitwise calculations in_breakpoint_table()

A modulo operation is used for calculating the current offset from a
breakpoint within the breakpoint table. As instruction lengths are
always a power of 2, this can be replaced with a bitwise 'and'. The
current check for word alignment can be replaced with checking that the
lower 2 bits are not set.

Suggested-by: Christophe Leroy <[email protected]>
Signed-off-by: Jordan Niethe <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Reviewed-by: Alistair Popple <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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