UPSTREAM: i2c: qcom-geni: add desc struct to prepare support for I2C Master Hub variant

The I2C Master Hub is a stripped down version of the GENI Serial Engine
QUP Wrapper Controller but only supporting I2C serial engines without
DMA support.

Those I2C serial engines variants have some requirements:
- a separate "core" clock
- doesn't support DMA, thus no memory interconnect path
- fixed FIFO size not discoverable in the HW_PARAM_0 register

Add a desc struct specifying all those requirements which will be used in
a next change when adding the I2C Master Hub serial engine compatible.

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

Bug: 370629635
Change-Id: I9f007f3f4f435e59e41849d357fe0ed72b81c63d
(cherry picked from commit 14d02fba)
Signed-off-by: Praveen Talari <quic_ptalari@quicinc.com>