clk: qcom: gcc-sm8550: Do not turn off PCIe GDSCs during gdsc_disable()

With PWRSTS_OFF_ON, PCIe GDSCs are turned off during gdsc_disable(). This
can happen during scenarios such as system suspend and breaks the resume
of PCIe controllers from suspend.

So use PWRSTS_RET_ON to indicate the GDSC driver to not turn off the GDSCs
during gdsc_disable() and allow the hardware to transition the GDSCs to
retention when the parent domain enters low power state during system
suspend.

Cc: [e-mail] # 6.2
Fixes: 955f2ea3b9e9 ("clk: qcom: Add GCC driver for SM8550")
Reported-by: Neil Armstrong <[e-mail]>
Signed-off-by: Manivannan Sadhasivam <[e-mail]>
Reviewed-by: Neil Armstrong <[e-mail]>
Tested-by: Neil Armstrong <[e-mail]> # on QRD8550
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bjorn Andersson <[e-mail]>

drivers/clk/qcom/gcc-sm8550.c

···
 	.pd = {
 		.name = "pcie_0_gdsc",
 	},
-	.pwrsts = PWRSTS_OFF_ON,
+	.pwrsts = PWRSTS_RET_ON,
 	.flags = VOTABLE | POLL_CFG_GDSCR | RETAIN_FF_ENABLE,
 };
 
···
 	.pd = {
 		.name = "pcie_0_phy_gdsc",
 	},
-	.pwrsts = PWRSTS_OFF_ON,
+	.pwrsts = PWRSTS_RET_ON,
 	.flags = VOTABLE | POLL_CFG_GDSCR | RETAIN_FF_ENABLE,
 };
 
···
 	.pd = {
 		.name = "pcie_1_gdsc",
 	},
-	.pwrsts = PWRSTS_OFF_ON,
+	.pwrsts = PWRSTS_RET_ON,
 	.flags = VOTABLE | POLL_CFG_GDSCR | RETAIN_FF_ENABLE,
 };
 
···
 	.pd = {
 		.name = "pcie_1_phy_gdsc",
 	},
-	.pwrsts = PWRSTS_OFF_ON,
+	.pwrsts = PWRSTS_RET_ON,
 	.flags = VOTABLE | POLL_CFG_GDSCR | RETAIN_FF_ENABLE,
 };