am33xx: Use regular spl_board_init instead of am33xx_spl_board_init

The am33xx_spl_board_init function was introduced as a way to add
board-specific SPL init for AM33xx devices since the spl_board_init
function was already used for SoC-specific init.

Now that the SoC-specific SPL init was moved to spl_soc_init, we can
use spl_board_init for this purpose and get rid of
am33xx_spl_board_init.

Rename the function in board files and enable the related config
option for concerned boards.

Signed-off-by: Paul Kocialkowski <paulk@sys-base.io>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/board/eets/pdu001/board.c b/board/eets/pdu001/board.c
index 2ad256f..00f9a5e 100644
--- a/board/eets/pdu001/board.c
+++ b/board/eets/pdu001/board.c
@@ -56,10 +56,10 @@
  *  boot device save register
  * -------------------------
  * The boot device can be quired by 'spl_boot_device()' in
- * 'am33xx_spl_board_init'. However it can't be saved in the u-boot
+ * 'spl_board_init'. However it can't be saved in the u-boot
  * environment here. In turn 'spl_boot_device' can't be called in
  * 'board_late_init' which allows writing to u-boot environment.
- * To get the boot device from 'am33xx_spl_board_init' to
+ * To get the boot device from 'spl_board_init' to
  * 'board_late_init' we therefore use a scratch register from the RTC.
  */
 #define CFG_SYS_RTC_SCRATCH0 0x60
@@ -192,7 +192,7 @@
 const struct dpll_params dpll_ddr_bone_black = {
 		400, OSC - 1, 1, -1, -1, -1, -1};
 
-void am33xx_spl_board_init(void)
+void spl_board_init(void)
 {
 	struct ctrl_dev *cdev = (struct ctrl_dev *)CTRL_DEVICE_BASE;