powerpc: Migrate HIGH_BATS to Kconfig

Migrate the CONFIG_HIGH_BATS variable to Kconfig.

Signed-off-by: Mario Six <mario.six@gdsys.cc>
diff --git a/configs/MPC8313ERDB_33_defconfig b/configs/MPC8313ERDB_33_defconfig
index c99d739..641c6c8 100644
--- a/configs/MPC8313ERDB_33_defconfig
+++ b/configs/MPC8313ERDB_33_defconfig
@@ -2,6 +2,7 @@
 CONFIG_SYS_TEXT_BASE=0xFE000000
 CONFIG_SYS_CLK_FREQ=33333333
 CONFIG_MPC83xx=y
+CONFIG_HIGH_BATS=y
 CONFIG_TARGET_MPC8313ERDB_NOR=y
 CONFIG_SYSTEM_PLL_FACTOR_5_1=y
 CONFIG_CORE_PLL_RATIO_2_1=y