ARM: OMAP2+: am33xx-restart: fix function name in kernel-doc

Use the correct name in kernel-doc notation to prevent a
kernel-doc warning:

am33xx-restart.c:20: warning: expecting prototype for am3xx_restart(). Prototype was for am33xx_restart() instead

Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Tony Lindgren <tony@atomide.com>
Cc: linux-omap@vger.kernel.org
Cc: Russell King <linux@armlinux.org.uk>
Cc: linux-arm-kernel@lists.infradead.org
Cc: patches@armlinux.org.uk
Message-ID: <20240117011004.22669-2-rdunlap@infradead.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>