ARC: [hsdk]: Enable FPU_SAVE_RESTORE

HSDK has hardware floating point and the common use case is with
glibc+hf so enable that as default.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

arch/arc/plat-hsdk/Kconfig

@@ -7,6 +7,7 @@ menuconfig ARC_SOC_HSDK
 	depends on ISA_ARCV2
 	select ARC_HAS_ACCL_REGS
 	select ARC_IRQ_NO_AUTOSAVE
+	select ARC_FPU_SAVE_RESTORE
 	select CLK_HSDK
 	select RESET_CONTROLLER
 	select RESET_HSDK