arm/arm64: Rate-limited warnings for SWP emulation

Large amounts of messages regarding SWP emulation may flood
the kernel logs. Modify the ARM / ARM64 SWP emulation logic
to print these messages as a rate-limited warning.

Change-Id: I024022160fda073609604a42555f50df7b69b0f3
Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>