Makefile: move all Power Architecture boards into boards.cfg

Clean up Makefile, and drop a lot of the config.mk files on the way.

We now also automatically pick all boards that are listed in
boards.cfg (and with all configurations), so we can drop the redundant
entries from MAKEALL to avoid building these twice.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/include/configs/MHPC.h b/include/configs/MHPC.h
index 19a288c..7ad2712 100644
--- a/include/configs/MHPC.h
+++ b/include/configs/MHPC.h
@@ -43,6 +43,8 @@
 #define CONFIG_BOARD_EARLY_INIT_F 1	/* do special hardware init.	*/
 #define CONFIG_MISC_INIT_R	1
 
+#define	CONFIG_SYS_TEXT_BASE	0xfe000000
+
 #define CONFIG_8xx_GCLK_FREQ	MPC8XX_SPEED
 #undef	CONFIG_8xx_CONS_SMC1
 #define CONFIG_8xx_CONS_SMC2	1	/* Console is on SMC2		*/