scsi: ufs: ufs-qcom: Enable Auto Hibern8 clock request support

On platforms that support Auto Hibern8 (AH8), the UFS controller can
autonomously de-assert clk_req signals to the Global Clock Controller
when entering the Hibern8 state. This allows Global Clock Controller
(GCC) to gate unused clocks, improving power efficiency.

Enable the Clock Request feature by setting the UFS_HW_CLK_CTRL_EN bit
in the UFS_AH8_CFG register, as recommended in the Hardware Programming
Guidelines.

Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Palash Kambar <palash.kambar@oss.qualcomm.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Link: https://patch.msgid.link/20260423102023.3779489-3-palash.kambar@oss.qualcomm.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

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