[ARM] pxa: rename macro from pxa9xx to pxa93x

Because original macro can only judge whether current CPU is pxa93x,
rename the macro to correct name.

Signed-off-by: Haojian Zhuang <haojian.zhuang@marvell.com>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
1 file changed