spi: sh-msiof: abort transfers when reset times out

spi: sh-msiof: abort transfers when reset times out

sh_msiof_spi_reset_regs() asserts TX/RX reset and polls until the reset
bits clear, but the poll result is ignored. sh_msiof_transfer_one() can
therefore continue programming a transfer after the controller did not
leave reset.

Return the reset poll result from the helper and abort the transfer on
timeout, matching the existing transfer path's error-return style.

Fixes: fedd6940682a ("spi: sh-msiof: Add reset of registers before starting transfer")
Signed-off-by: Pengpeng Hou <pengpeng@iscas.ac.cn>
Link: https://patch.msgid.link/20260623135834.55442-1-pengpeng@iscas.ac.cn
Signed-off-by: Mark Brown <broonie@kernel.org>