pwm: lpss: Fix build failure on PowerPC
An x86 build seems to pull in the linux/io.h include indirectly. On PowerPC that doesn't happen and the build breaks due to the readl() and writel() functions not being declared. Fix this by explicitly including linux/io.h. Reported-by: NStephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: NThierry Reding <thierry.reding@gmail.com>
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