devel/xtensa-esp-elf: Fix toolchain version string

xtensa-esp32-elf-cc was reporting:

xtensa-esp-elf-cc (crosstool-NG UNKNOWN) 13.2.0

Update to correctly show the version of crosstool used:

xtensa-esp-elf-cc (crosstool-NG esp-13.2.0_20240530) 13.2.0

(cherry picked from commit ea2a77b789f4db0790a248bd6ff9996054e9e5bc)