ARM: pxa: moved pxa27x_keypad.h to platform pxa directory

mach-mmp utilizes pxa27x_keypad code so we need to move header to
platform pxa directory.

Signed-off-by: Mark F. Brown <mark.brown314@gmail.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
16 files changed