utsname fields too short on some PowerPC BSPs (qoriq, mpc55xx)

[Joel Sherrill]

Hi

The following BSPs have a new warning for a writing too much with
snprintf():

powerpc-mpc5566evb_spe
powerpc-mpc5674f_ecu508_app
powerpc-mpc5674f_ecu508_boot
powerpc-mpc5674fevb_spe
powerpc-mpc5674f_rsm6
powerpc-phycore_mpc5554
powerpc-qoriq_core_0
powerpc-qoriq_core_1
powerpc-qoriq_p1020rdb

../../../../../../rtems/c/src/../../cpukit/libcsupport/src/utsname.c:56:55:
warning: '%s' directive output truncated writing 29 bytes into a region of
size 24 [-Wformat-truncation=]

The code is:

  snprintf( name->machine, sizeof(name->machine), "%s/%s", CPU_NAME,
CPU_MODEL_NAME );

The fields are 32 bytes. Does anyone see a problem with increasing them to
48?

--joel
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