[console] move the history buffer into static memory, remove console_init

No need to malloc this memory if it's always going to be initialized
anyway. Add history disabling switch to a few targets to make sure both
builds are tested.

target/sifive-e/rules.mk

@@ -15,6 +15,7 @@ GLOBAL_DEFINES += SIFIVE_FREQ=16000000
 MODULE_SRCS := $(LOCAL_DIR)/target.c
 
 # set some global defines based on capability
+GLOBAL_DEFINES += CONSOLE_ENABLE_HISTORY=0
 GLOBAL_DEFINES += PLATFORM_HAS_DYNAMIC_TIMER=1
 GLOBAL_DEFINES += ARCH_RISCV_CLINT_BASE=0x02000000
 GLOBAL_DEFINES += ARCH_RISCV_MTIME_RATE=32768

target/stellaris-launchpad/rules.mk

@@ -6,6 +6,7 @@ STELLARIS_CHIP := LM4F120H5QR
 PLATFORM := stellaris
 
 GLOBAL_DEFINES += \
+	CONSOLE_ENABLE_HISTORY=0 \
 	TARGET_HAS_DEBUG_LED=1 \
 	CRYSTAL_FREQ=16000000