riscv: Add cvitek SoC files to the build

Reviewed by:	br, jrtc27
Differential Revision:	https://reviews.freebsd.org/D48533

sys/riscv/conf/GENERIC

@@ -206,6 +206,7 @@ device		iicoc		# OpenCores I2C controller support
 
 # Include SoC specific configuration
 include		"std.allwinner"
+include		"std.cvitek"
 include		"std.eswin"
 include		"std.sifive"
 include		"std.starfive"

sys/riscv/conf/std.cvitek

@@ -0,0 +1,14 @@
+#
+# CVITEK SoC support
+#
+
+device	fdt
+device	dwc
+device	dwgpio
+device	uart_snps
+device	dwc_cvitek
+device	sdhci_cvitek
+device	cvitek_reset
+device	cvitek_restart
+
+files	"../cvitek/files.cvitek"

sys/riscv/cvitek/files.cvitek

@@ -0,0 +1,4 @@
+riscv/cvitek/cvitek_restart.c		optional fdt cvitek_restart
+riscv/cvitek/cvitek_reset.c		optional fdt cvitek_reset
+dev/dwc/if_dwc_cvitek.c			optional fdt dwc_cvitek
+dev/sdhci/sdhci_fdt_cvitek.c		optional fdt sdhci sdhci_cvitek regulator