sh: sh7264: Remove bogus SSU GPIO function definitions

SH7264 has no Synchronous Serial Communication Unit (SSU).
Remove the bogus enum IDs, which caused holes in pinmux_func_gpios[].
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20191218194812.12741-6-geert+renesas@glider.be

arch/sh/include/cpu-sh2a/cpu/sh7264.h

@@ -112,12 +112,6 @@ enum {
 	GPIO_FN_TIOC0D, GPIO_FN_TIOC0C, GPIO_FN_TIOC0B, GPIO_FN_TIOC0A,
 	GPIO_FN_TCLKD, GPIO_FN_TCLKC, GPIO_FN_TCLKB, GPIO_FN_TCLKA,
 
-	/* SSU */
-	GPIO_FN_SCS0_PD, GPIO_FN_SSO0_PD, GPIO_FN_SSI0_PD, GPIO_FN_SSCK0_PD,
-	GPIO_FN_SCS0_PF, GPIO_FN_SSO0_PF, GPIO_FN_SSI0_PF, GPIO_FN_SSCK0_PF,
-	GPIO_FN_SCS1_PD, GPIO_FN_SSO1_PD, GPIO_FN_SSI1_PD, GPIO_FN_SSCK1_PD,
-	GPIO_FN_SCS1_PF, GPIO_FN_SSO1_PF, GPIO_FN_SSI1_PF, GPIO_FN_SSCK1_PF,
-
 	/* SCIF */
 	GPIO_FN_SCK0, GPIO_FN_SCK1, GPIO_FN_SCK2, GPIO_FN_SCK3,
 	GPIO_FN_RXD0, GPIO_FN_RXD1, GPIO_FN_RXD2, GPIO_FN_RXD3,