flash/stm32lx: mention explicitly that this driver covers STM32 L0 and L1

this is to avoid confusion with STM32 L4, L4+ and L5 families

also:
 - a warning message is changed to error
 - stm32l0x and stm32l1x aliases has been created to permit
   the usage of either names

Change-Id: If3f16d2a3b7d1369959aa7407da37a9076ea91d7
Signed-off-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>
Reviewed-on: http://openocd.zylin.com/5437
Reviewed-by: Marc Schink <dev@zapb.de>
Tested-by: jenkins
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>

doc/openocd.texi

@@ -6852,7 +6852,7 @@ stm32h7x option_write 0 0x20 0x8000000 0x8000000
 @end deffn
 
 @deffn {Flash Driver} stm32lx
-All members of the STM32L microcontroller families from STMicroelectronics
+All members of the STM32L0 and STM32L1 microcontroller families from STMicroelectronics
 include internal flash and use ARM Cortex-M3 and Cortex-M0+ cores.
 The driver automatically recognizes a number of these chips using
 the chip identification register, and autoconfigures itself.

src/flash/nor/stm32lx.c

@@ -756,7 +756,7 @@ static int stm32lx_probe(struct flash_bank *bank)
 	}
 
 	if (n == ARRAY_SIZE(stm32lx_parts)) {
-		LOG_WARNING("Cannot identify target as a STM32L family.");
+		LOG_ERROR("Cannot identify target as an STM32 L0 or L1 family device.");
 		return ERROR_FAIL;
 	} else {
 		LOG_INFO("Device: %s", stm32lx_info->part_info.device_str);

src/flash/startup.tcl

@@ -109,6 +109,10 @@ proc stm32f3x args { eval stm32f1x $args }
 proc stm32f4x args { eval stm32f2x $args }
 proc stm32f7x args { eval stm32f2x $args }
 
+# stm32lx driver supports both STM32 L0 and L1 devices
+proc stm32l0x args { eval stm32lx $args }
+proc stm32l1x args { eval stm32lx $args }
+
 # stm32wb uses the same flash driver as the stm32l4x
 proc stm32wbx args { eval stm32l4x $args }