pwm: tegra: Rename mmio_base to regs

The former is much longer to type and is ambiguous because the value
stored in the field is not the (physical) base address of the memory-
mapped I/O registers, but the virtual address of those registers as
mapped through the MMU.

Signed-off-by: Thierry Reding <thierry.reding@gmail.com>
1 file changed