sparc: Kconfig: Move the CMD_AMBAPP command to Kconfig

Add an initr function in the board_r.c file for the AMBA Plug&Play
command. Add a Kconfig entry for the ambapp command and remove all
CONFIG_CMD_AMBAPP defines from the board configuration headers.

Add a Kconfig entry to display the AMBA Plug&Play information
on startup. This option is off by default. Remove relevent define
from board configuration headers.

Signed-off-by: Francois Retief <fgretief@spaceteq.co.za>
diff --git a/configs/grsim_defconfig b/configs/grsim_defconfig
index b0295f2..a5ea7ab 100644
--- a/configs/grsim_defconfig
+++ b/configs/grsim_defconfig
@@ -13,3 +13,4 @@
 # CONFIG_CMD_SETEXPR is not set
 # CONFIG_CMD_NET is not set
 # CONFIG_CMD_NFS is not set
+CONFIG_SYS_AMBAPP_PRINT_ON_STARTUP=y