uboot-envtools: fix code formatting style in uci-defaults files

Few minor code formatting style fixes, including:

- keep one board per line
- always use "|\" (for consistency)
- remove redundant double quotes and empty lines

Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

package/boot/uboot-envtools/files/imx6

@@ -25,7 +25,7 @@ case "$board" in
 		ubootenv_add_uci_config /dev/mmcblk0 0xd1400 0x20000 0x20000
 	fi
 	;;
-"wandboard")
+wandboard)
 	ubootenv_add_uci_config "/dev/mmcblk0" "0x60000" "0x2000" "0x2000"
 	;;
 esac

package/boot/uboot-envtools/files/ipq

@@ -13,12 +13,11 @@ touch /etc/config/ubootenv
 
 board=$(ipq806x_board_name)
 
-
 case "$board" in
-"ea8500")
+ea8500)
 	ubootenv_add_uci_config "/dev/mtd10" "0x0" "0x20000" "0x20000"
 	;;
-"nbg6817")
+nbg6817)
 	ubootenv_add_uci_config "/dev/mtdblock9" "0x0" "0x10000" "0x10000"
 	;;
 esac

package/boot/uboot-envtools/files/kirkwood

@@ -14,16 +14,16 @@ touch /etc/config/ubootenv
 board=$(kirkwood_board_name)
 
 case "$board" in
-"dockstar" | \
-"guruplug-server-plus" | \
-"ib62x0" | \
-"linksys-viper" | \
-"pogo_e02" | \
-"sheevaplug" | \
-"sheevaplug-esata" )
+dockstar|\
+guruplug-server-plus|\
+ib62x0|\
+linksys-viper|\
+pogo_e02|\
+sheevaplug|\
+sheevaplug-esata)
 	ubootenv_add_uci_config "/dev/mtd1" "0x0" "0x20000" "0x20000"
 	;;
-"linksys-audi")
+linksys-audi)
 	ubootenv_add_uci_config "/dev/mtd1" "0x0" "0x4000" "0x4000"
 	;;
 esac

package/boot/uboot-envtools/files/mvebu

@@ -15,7 +15,9 @@ touch /etc/config/ubootenv
 board=$(mvebu_board_name)
 
 case "$board" in
-armada-385-linksys-caiman|armada-385-linksys-cobra|armada-385-linksys-shelby)
+armada-385-linksys-caiman|\
+armada-385-linksys-cobra|\
+armada-385-linksys-shelby)
 	ubootenv_add_uci_config "/dev/mtd1" "0x0" "0x20000" "0x40000"
 	;;
 armada-385-linksys-rango)