risc-v/rv32im: Set MAXOPTIMIZATION regardless of any debug options

arch/risc-v/src/rv32im/Toolchain.defs

@@ -49,6 +49,8 @@ endif
 
 ifeq ($(CONFIG_DEBUG_CUSTOMOPT),y)
   MAXOPTIMIZATION := $(CONFIG_DEBUG_OPTLEVEL)
+else
+  MAXOPTIMIZATION ?= -Os
 endif
 
 # Generic GNU RVG toolchain
@@ -67,13 +69,6 @@ ifeq ($(CONFIG_RISCV_TOOLCHAIN),GNU_RVG)
   endif
 endif
 
-# Individual tools may limit the optimization level but, by default, the
-# optimization level will be set to -Os
-
-ifeq ($(CONFIG_DEBUG_SYMBOLS),)
-MAXOPTIMIZATION ?= -Os
-endif
-
 # Default toolchain
 
 CC = $(CROSSDEV)gcc