arm-bsp/musca-*: use newlib for libc

Whilst glibc is definitely not an option for Cortex-M cores, newlib is
a viable libc implementation that is useful to default too.

Change-Id: I1f3a53e43945f486aa2e7bce019f105c55df5e87
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

meta-arm-bsp/conf/machine/musca-b1.conf

@@ -10,7 +10,7 @@ PREFERRED_VERSION_trusted-firmware-m = "1.0"
 require conf/machine/include/tune-cortexm33.inc
 
 # GLIBC will not work with Cortex-M.
-TCLIBC = "baremetal"
+TCLIBC = "newlib"
 
 # For runqemu
 require conf/machine/include/qemu.inc

meta-arm-bsp/conf/machine/musca-s1.conf

@@ -10,4 +10,4 @@ PREFERRED_VERSION_trusted-firmware-m = "1.0"
 require conf/machine/include/tune-cortexm33.inc
 
 # GLIBC will not work with Cortex-M.
-TCLIBC = "baremetal"
+TCLIBC = "newlib"