Convert CONFIG_SPL_INIT_MINIMAL et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SPL_INIT_MINIMAL
   CONFIG_SPL_FLUSH_IMAGE
   CONFIG_SPL_SKIP_RELOCATE

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/freescale/common/Makefile b/board/freescale/common/Makefile
index 4df4849..4214c6e 100644
--- a/board/freescale/common/Makefile
+++ b/board/freescale/common/Makefile
@@ -6,10 +6,12 @@
 MINIMAL=
 
 ifdef CONFIG_SPL_BUILD
+ifndef CONFIG_TPL_BUILD
 ifdef CONFIG_SPL_INIT_MINIMAL
 MINIMAL=y
 endif
 endif
+endif
 
 ifdef MINIMAL
 # necessary to create built-in.o
diff --git a/board/freescale/p1010rdb/Makefile b/board/freescale/p1010rdb/Makefile
index 36b34c7..a00806e 100644
--- a/board/freescale/p1010rdb/Makefile
+++ b/board/freescale/p1010rdb/Makefile
@@ -5,10 +5,12 @@
 MINIMAL=
 
 ifdef CONFIG_SPL_BUILD
+ifndef CONFIG_TPL_BUILD
 ifdef CONFIG_SPL_INIT_MINIMAL
 MINIMAL=y
 endif
 endif
+endif
 
 ifdef MINIMAL
 obj-y	+= spl_minimal.o
diff --git a/board/freescale/p1_p2_rdb_pc/Makefile b/board/freescale/p1_p2_rdb_pc/Makefile
index a7736d8..cbdb250 100644
--- a/board/freescale/p1_p2_rdb_pc/Makefile
+++ b/board/freescale/p1_p2_rdb_pc/Makefile
@@ -5,10 +5,12 @@
 MINIMAL=
 
 ifdef CONFIG_SPL_BUILD
+ifndef CONFIG_TPL_BUILD
 ifdef CONFIG_SPL_INIT_MINIMAL
 MINIMAL=y
 endif
 endif
+endif
 
 ifdef MINIMAL
 obj-y	+= spl_minimal.o