UPSTREAM: soc: qcom: geni-se: Add M_TX_FIFO_NOT_EMPTY bit definition

According to the docs I have, bit 21 of the status register is
asserted when the FIFO is _not_ empty. Add the definition.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240112150307.1.I7dc0993c1e758a1efedd651e7e1670deb1b430fb@changeid


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 370629635
Change-Id: I1372fe15b0d8b8ee302dccbc81f832be15a93ee5
(cherry picked from commit 48667611)
Signed-off-by: Praveen Talari <quic_ptalari@quicinc.com>