arm: at91: add support for mini-box picosam9g45 board

Bootlog:
U-Boot SPL 2015.10-rc1-00452-g96a7ed1 (Aug 17 2015 - 10:32:21)
mci: setting clock 258000 Hz, block size 512
mci: setting clock 258000 Hz, block size 512
mci: setting clock 258000 Hz, block size 512
mci: setting clock 33024000 Hz, block size 512
reading u-boot.img
reading u-boot.img

U-Boot 2015.10-rc1-00452-g96a7ed1 (Aug 17 2015 - 10:32:21 +0000)

CPU: AT91SAM9G45
Crystal frequency:       12 MHz
CPU clock        :      400 MHz
Master clock     :  133.333 MHz
       Watchdog enabled
DRAM:  256 MiB
WARNING: Caches not enabled
MMC:   mci: 0
mci: setting clock 260416 Hz, block size 512
mci: setting clock 260416 Hz, block size 512
mci: setting clock 260416 Hz, block size 512
mci: setting clock 33333333 Hz, block size 512
reading uboot.env
In:    serial
Out:   serial
Err:   serial
Net:   macb0
Error: macb0 address not set.

Hit any key to stop autoboot:  0
U-Boot>

Signed-off-by: Erik van Luijk <evanluijk@interact.nl>
[add 'picosam9g45_defconfig' to MAINTAINERS]
Signed-off-by: Andreas Bießmann <andreas.devel@googlemail.com>
diff --git a/board/mini-box/picosam9g45/led.c b/board/mini-box/picosam9g45/led.c
new file mode 100644
index 0000000..dc1013a
--- /dev/null
+++ b/board/mini-box/picosam9g45/led.c
@@ -0,0 +1,25 @@
+/*
+ * (C) Copyright 2007-2008
+ * Stelian Pop <stelian@popies.net>
+ * Lead Tech Design <www.leadtechdesign.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <common.h>
+#include <asm/io.h>
+#include <asm/arch/at91sam9g45.h>
+#include <asm/arch/at91_pmc.h>
+#include <asm/arch/gpio.h>
+
+void coloured_LED_init(void)
+{
+	struct at91_pmc *pmc = (struct at91_pmc *)ATMEL_BASE_PMC;
+
+	/* Enable clock */
+	writel(1 << ATMEL_ID_PIODE, &pmc->pcer);
+
+	at91_set_gpio_output(CONFIG_GREEN_LED, 1);
+
+	at91_set_gpio_value(CONFIG_GREEN_LED, 1);
+}