picolibc: Add io-long-long=true and printf-small-ultoa=true

The first option ensures that long long values will be displayed
correctly with either float or integer printf variants. To mitigate
memory used by this, the printf-small-ultoa option avoids pulling in
soft division code for long long types.

There's a new 'minimal' variant for space-sensitive applications; that
version does not get long long support with this change.

Signed-off-by: Keith Packard <keithp@keithp.com>

Author: keith-packard

configs/common.config

@@ -72,4 +72,4 @@ CT_PICOLIBC_SRC_CUSTOM=y
 CT_PICOLIBC_CUSTOM_LOCATION="${GITHUB_WORKSPACE}/picolibc"
 CT_LIBC_PICOLIBC_GLOBAL_ATEXIT=y
 CT_LIBC_PICOLIBC_EXTRA_SECTIONS=y
-CT_LIBC_PICOLIBC_EXTRA_CONFIG_ARRAY="-Dthread-local-storage=auto -Derrno-function=zephyr -Dsysroot-install=true -Dsysroot-install-skip-checks=true"
+CT_LIBC_PICOLIBC_EXTRA_CONFIG_ARRAY="-Dthread-local-storage=auto -Derrno-function=zephyr -Dsysroot-install=true -Dsysroot-install-skip-checks=true -Dio-long-long=true -Dprintf-small-ultoa=true"