arch/arm/rp23xx: add missing fpu init for smp cores

On SMP systems we should enable FPU on each core

FPU extenstion support must be enabled on each core as stated on 4.6.5
arm m33 devices generic user guide

Signed-off-by: Serg Podtynnyi <serg@podtynnyi.com>

arch/arm/src/rp23xx/rp23xx_cpustart.c

@@ -144,6 +144,8 @@ static void core1_boot(void)
   arm_initialize_stack();
 #endif
 
+  arm_fpuconfig();
+
   fifo_drain();
 
   /* Setup NVIC */