phy: qualcomm: Fix 28 nm Hi-Speed USB PHY OF dependency

This Kconfig entry should declare a dependency on OF

Fixes: 67b27dbe ("phy: qualcomm: Add Synopsys 28nm Hi-Speed USB PHY driver")
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Link: https://lore.kernel.org/r/20201113151225.1657600-3-bryan.odonoghue@linaro.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/qualcomm/Kconfig

@@ -87,7 +87,7 @@ config PHY_QCOM_USB_HSIC
 
 config PHY_QCOM_USB_HS_28NM
 	tristate "Qualcomm 28nm High-Speed PHY"
-	depends on ARCH_QCOM || COMPILE_TEST
+	depends on OF && (ARCH_QCOM || COMPILE_TEST)
 	depends on EXTCON || !EXTCON # if EXTCON=m, this cannot be built-in
 	select GENERIC_PHY
 	help