ti: fastboot: Move weak overrides to board files

Overriding fastboot_set_reboot_flag() in arch/arm/mach-omap2/boot-common.c
leaves it applying all boards that derive from this, not just the ones which
have support for Android bootloader flow. Move the weak function override to
the relevant board files.

Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/arch/arm/mach-omap2/boot-common.c b/arch/arm/mach-omap2/boot-common.c
index b22b671..d4a1e2e 100644
--- a/arch/arm/mach-omap2/boot-common.c
+++ b/arch/arm/mach-omap2/boot-common.c
@@ -236,13 +236,3 @@
 	ahci_reset((void __iomem *)DWC_AHSATA_BASE);
 }
 #endif
-
-#if CONFIG_IS_ENABLED(FASTBOOT) && !CONFIG_IS_ENABLED(ENV_IS_NOWHERE)
-int fastboot_set_reboot_flag(void)
-{
-	printf("Setting reboot to fastboot flag ...\n");
-	env_set("dofastboot", "1");
-	env_save();
-	return 0;
-}
-#endif
diff --git a/board/ti/am57xx/board.c b/board/ti/am57xx/board.c
index fd9d207..177a324 100644
--- a/board/ti/am57xx/board.c
+++ b/board/ti/am57xx/board.c
@@ -1178,5 +1178,15 @@
 	secure_tee_install((u32)tee_image);
 }
 
+#if CONFIG_IS_ENABLED(FASTBOOT) && !CONFIG_IS_ENABLED(ENV_IS_NOWHERE)
+int fastboot_set_reboot_flag(void)
+{
+	printf("Setting reboot to fastboot flag ...\n");
+	env_set("dofastboot", "1");
+	env_save();
+	return 0;
+}
+#endif
+
 U_BOOT_FIT_LOADABLE_HANDLER(IH_TYPE_TEE, board_tee_image_process);
 #endif
diff --git a/board/ti/dra7xx/evm.c b/board/ti/dra7xx/evm.c
index 6918f4d..bbe5445 100644
--- a/board/ti/dra7xx/evm.c
+++ b/board/ti/dra7xx/evm.c
@@ -1188,5 +1188,15 @@
 	secure_tee_install((u32)tee_image);
 }
 
+#if CONFIG_IS_ENABLED(FASTBOOT) && !CONFIG_IS_ENABLED(ENV_IS_NOWHERE)
+int fastboot_set_reboot_flag(void)
+{
+	printf("Setting reboot to fastboot flag ...\n");
+	env_set("dofastboot", "1");
+	env_save();
+	return 0;
+}
+#endif
+
 U_BOOT_FIT_LOADABLE_HANDLER(IH_TYPE_TEE, board_tee_image_process);
 #endif