configs: sama5d27: Fix the 'reset' command

configs: sama5d27: Fix the 'reset' command

Since commit 61040097a9d1 ("reset: at91: Add reset driver for basic
assert/deassert operations") the "atmel,sama5d3-rstc" compatible for
the sama5d2 reset controller in sama5d2.dtsi is not handled by
CONFIG_SYSRESET_AT91 anymore, but by CONFIG_RESET_AT91 now.

This resulted in the following error, when trying to reset from the U-Boot
shell on a sama5d27_wlsom1 board:

 => reset
 resetting ...
 System reset not supported on this platform
 ### ERROR ### Please RESET the board ###

Fix it by enabling the CONFIG_RESET_AT91 driver in all sama5d27 defconfigs.

Tested on a sama5d27_wlsom1 board.

Based on the fix in commit e1ee52ca56fc ("configs: at91: sam9x60: Switch
to new reset driver")

Fixes: 61040097a9d1 ("reset: at91: Add reset driver for basic assert/deassert operations")
Signed-off-by: Fabio Estevam <festevam@denx.de>