MIPS: bcm47xx: read baordrev without prefix from sprom
When the boardrev with a prefix is not available, try to read it without a prefix. This is based on code from the Broadcom SDK. Signed-off-by: NHauke Mehrtens <hauke@hauke-m.de> Acked-by: NRalf Baechle <ralf@linux-mips.org> Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>
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