board: purism: Remove <common.h> and add needed includes

Remove <common.h> from this board vendor directory and when needed
add missing include files directly.

Signed-off-by: Tom Rini <trini@konsulko.com>

board/purism/librem5/librem5.c

@@ -4,7 +4,6 @@
  * Copyright 2021 Purism
  */
 
-#include <common.h>
 #include <malloc.h>
 #include <errno.h>
 #include <asm/io.h>

board/purism/librem5/lpddr4_timing.c

@@ -4,7 +4,6 @@
  */
 
 #include <linux/kernel.h>
-#include <common.h>
 #include <asm/arch/ddr.h>
 #include <asm/arch/lpddr4_define.h>
 

board/purism/librem5/lpddr4_timing_b0.c

@@ -4,7 +4,6 @@
  */
 
 #include <linux/kernel.h>
-#include <common.h>
 #include <asm/arch/ddr.h>
 #include <asm/arch/lpddr4_define.h>
 

board/purism/librem5/spl.c

@@ -4,7 +4,7 @@
  * Copyright 2021 Purism
  */
 
-#include <common.h>
+#include <config.h>
 #include <asm/io.h>
 #include <errno.h>
 #include <asm/io.h>