ramips: add support for YUKAI Engineering Inc. BOCCO

BOCCO is a communication robot provided by YUKAI Engineering Inc.

SoC: MT7620A
MEM: 256MB
Flash: 8MB
NAND: 512MB (non support)
Include Sound DAC and AMP.
No Wired Ethernet.

Signed-off-by: YuheiOKAWA <tochiro.srchack@gmail.com>
(cherry picked from commit d91953cb53)

target/linux/ramips/base-files/lib/ramips.sh

@@ -76,6 +76,9 @@ ramips_board_detect() {
 	*"BC2")
 		name="bc2"
 		;;
+	*"BOCCO")
+		name="bocco"
+		;;
 	*"BR-6475nD")
 		name="br-6475nd"
 		;;