configs/stm32vldiscovery/scripts/stm32vldiscovery.ld: Fix SRAM and FLASH size in the linker script.
There is STM32F100RB with 8KB RAM and 128KB FLASH on the STM32VL Discovery kit. Invalid memory size could cause a hard fault.
Approved-by: GregoryN <gnutt@nuttx.org>