The EIFS value read from AR_D_GBL_IFS_EIFS register in core clocks and then
written back as microsecond value.
Signed-off-by: NAlex Hacker <hacker@epn.ru>
Acked-by: NFelix Fietkau <nbd@openwrt.org>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>