configs: Rename roc-rk3399-pc -> roc-pc-rk3399 defconfig

roc-rk3399-pc_defconfig is committed in below

commit <8a681f4c5aa15db51ad0209734859c9fe7c29cfd> ("rockchip: rk3399:
Add ROC-RK3399-PC support")

which doesn't follow the existing defconfigs on rk3399.

So, rename as followed with other rk3399 defconfigs.

Cc: Levin Du <djw@t-chip.com.cn>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/board/rockchip/evb_rk3399/MAINTAINERS b/board/rockchip/evb_rk3399/MAINTAINERS
index 1397917..1c508e5 100644
--- a/board/rockchip/evb_rk3399/MAINTAINERS
+++ b/board/rockchip/evb_rk3399/MAINTAINERS
@@ -58,7 +58,7 @@
 ROC-RK3399-PC
 M:	Levin Du <djw@t-chip.com.cn>
 S:	Maintained
-F:	configs/roc-rk3399-pc_defconfig
+F:	configs/roc-pc-rk3399_defconfig
 F:	arch/arm/dts/rk3399-roc-pc-u-boot.dtsi
 
 ROCK-PI-4
diff --git a/configs/roc-rk3399-pc_defconfig b/configs/roc-pc-rk3399_defconfig
similarity index 100%
rename from configs/roc-rk3399-pc_defconfig
rename to configs/roc-pc-rk3399_defconfig