[ARM] pxa: make cpu_is_pxa2* macros more consistent
1. add a CPUID table in the comment 2. make cpu_is_pxa25x() true for PXA210/250/255/26x 3. PXA210 is treated as PXA25x, all related code modified to reflect this Signed-off-by: NEric Miao <eric.miao@marvell.com> Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>
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