board: ti: am64x: Add board support for am64x evm

Add board specific initialization for am64x based boards.

Signed-off-by: Dave Gerlach <d-gerlach@ti.com>
diff --git a/arch/arm/mach-k3/Kconfig b/arch/arm/mach-k3/Kconfig
index 35edc6d..bfbce44 100644
--- a/arch/arm/mach-k3/Kconfig
+++ b/arch/arm/mach-k3/Kconfig
@@ -148,5 +148,6 @@
 	  after SPL from R5.
 
 source "board/ti/am65x/Kconfig"
+source "board/ti/am64x/Kconfig"
 source "board/ti/j721e/Kconfig"
 endif