ARM: 6324/1: cam60: move cam60_spi_devices to .init.data

cam60_spi_devices is passed to at91_add_device_spi which calls
spi_register_board_info.  The latter makes a copy of it, so living in
.init.data is OK.

This fixes the following warning in cam60_defconfig:
	WARNING: vmlinux.o(.data+0x2a00): Section mismatch in reference from the variable cam60_spi_devices to the (unknown reference) .init.data:(unknown)
	The variable cam60_spi_devices references
	the (unknown reference) __initdata (unknown)
	If the reference is valid then annotate the
	variable with __init* or __refdata (see linux/init.h) or name the variable:
	*_template, *_timer, *_sht, *_ops, *_probe, *_probe_one, *_console,

Acked-by: Andrew Victor <linux@maxim.org.za>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>