spi: sh_qspi: Drop SPBDCR wait
Waiting for SPBDCR == 1 is not required and is covered by the
subsequent wait for SPSR_SPRFF, so drop this.
Signed-off-by: NMarek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <nobuhiro.iwamatsu.yj@renesas.com>
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