pinctrl: pinctrl-aspeed-g6: Add more settings for USB2AHP function

AST2600 USB2AHP (USB PortA: PCIe EHCI to PHY) function needs to set the
register SCUC20[16]. Set it to enable the PCIe EHCI device on PCIe bus.
Besides, also add USB2AHP signal expressions into pin declarations.

Signed-off-by: Joe Wang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Linus Walleij <[e-mail]>

drivers/pinctrl/aspeed/pinctrl-aspeed-g6.c

···
 			SIG_DESC_SET(SCUC20, 16));
 SIG_EXPR_LIST_DECL_SEMG(A4, USB2ADDP, USBA, USB2AD, USB2AD_DESC);
 SIG_EXPR_LIST_DECL_SEMG(A4, USB2AHDP, USBA, USB2AH, USB2AH_DESC);
-SIG_EXPR_LIST_DECL_SEMG(A4, USB2AHPDP, USBA, USB2AHP, USB2AHP_DESC);
+SIG_EXPR_LIST_DECL_SEMG(A4, USB2AHPDP, USBA, USB2AHP, USB2AHP_DESC,
+			SIG_DESC_SET(SCUC20, 16));
 PIN_DECL_(A4, SIG_EXPR_LIST_PTR(A4, USB2ADPDP), SIG_EXPR_LIST_PTR(A4, USB2ADDP),
-	  SIG_EXPR_LIST_PTR(A4, USB2AHDP));
+	  SIG_EXPR_LIST_PTR(A4, USB2AHDP), SIG_EXPR_LIST_PTR(A4, USB2AHPDP));
 
 #define B4 253
 SIG_EXPR_LIST_DECL_SEMG(B4, USB2ADPDN, USBA, USB2ADP, USB2ADP_DESC);
···
 SIG_EXPR_LIST_DECL_SEMG(B4, USB2AHDN, USBA, USB2AH, USB2AH_DESC);
 SIG_EXPR_LIST_DECL_SEMG(B4, USB2AHPDN, USBA, USB2AHP, USB2AHP_DESC);
 PIN_DECL_(B4, SIG_EXPR_LIST_PTR(B4, USB2ADPDN), SIG_EXPR_LIST_PTR(B4, USB2ADDN),
-	  SIG_EXPR_LIST_PTR(B4, USB2AHDN));
+	  SIG_EXPR_LIST_PTR(B4, USB2AHDN), SIG_EXPR_LIST_PTR(B4, USB2AHPDN));
 
 GROUP_DECL(USBA, A4, B4);