brcm63xx: move CPVA502+ to dts

target/linux/brcm63xx/base-files/lib/brcm63xx.sh

target/linux/brcm63xx/dts/cpva502plus.dts

target/linux/brcm63xx/image/Makefile

...t/linux/brcm63xx/patches-3.14/519_board_CPVA502plus.patch

...es-3.14/520-bcm63xx-add-support-for-96368MVWG-board.patch

...s-3.14/521-bcm63xx-add-support-for-96368MVNgr-board.patch

target/linux/brcm63xx/patches-3.14/526-board_CT6373-1.patch

...ux/brcm63xx/patches-3.14/527-board_dva-g3810bn-tl-1.patch

target/linux/brcm63xx/patches-3.14/528-board_nb6.patch

target/linux/brcm63xx/patches-3.14/534-board_hw556.patch

target/linux/brcm63xx/patches-3.14/537-board_fast2504n.patch

...linux/brcm63xx/patches-3.14/560-board_963268gu_p300.patch

target/linux/brcm63xx/patches-3.14/561-board_WAP-5813n.patch

target/linux/brcm63xx/patches-3.14/562-board_VR-3025u.patch

target/linux/brcm63xx/patches-3.14/563-board_VR-3025un.patch

...linux/brcm63xx/patches-3.14/564-board_P870HW-51a_v2.patch

target/linux/brcm63xx/patches-3.14/565-board_hw520.patch

...ux/brcm63xx/patches-3.14/568-board_DGND3700v1_3800B.patch

...t/linux/brcm63xx/patches-3.18/519_board_CPVA502plus.patch

...es-3.18/520-bcm63xx-add-support-for-96368MVWG-board.patch