samples: net: remove POSIX_TIMERS and XSI_SINGLE_PROCESS

Remove POSIX_TIMERS and XSI_SINGLE_PROCESS dependencies from the aws
cloud sample and the lwm2m client sample, as they are no longer
required.

Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>

Author: Chris Friedt

samples/net/cloud/aws_iot_mqtt/prj.conf

@@ -39,7 +39,6 @@ CONFIG_NET_DHCPV4=y
 
 # SNTP
 CONFIG_SNTP=y
-CONFIG_POSIX_TIMERS=y
 CONFIG_NET_CONFIG_CLOCK_SNTP_INIT=y
 CONFIG_NET_CONFIG_SNTP_INIT_SERVER="0.pool.ntp.org"
 

samples/net/lwm2m_client/overlay-data-cache.conf

@@ -1,5 +1,4 @@
 CONFIG_ZCBOR=y
 CONFIG_ZCBOR_CANONICAL=y
 CONFIG_LWM2M_RW_SENML_CBOR_SUPPORT=y
-CONFIG_XSI_SINGLE_PROCESS=y
 CONFIG_LWM2M_RESOURCE_DATA_CACHE_SUPPORT=y