tests: net: all: kconfig: Do not assign promptless NET_INIT_PRIO

Assignments have no effect on promptless symbols. Flagged by
zephyrproject-rtos#20742.

NET_INIT_PRIO (defined in subsys/net/ip/Kconfig) is currently hardcoded
to 90 (it's not set via any Kconfig.defconfig files either). Maybe it
could be given a prompt or be removed, but just remove the assignment
for now.

Signed-off-by: Ulf Magnusson <[email protected]>

tests/net/all/prj.conf

@@ -44,7 +44,6 @@ CONFIG_NET_SHELL=y
 CONFIG_NET_SHELL_DYN_CMD_COMPLETION=y
 CONFIG_NET_IP_ADDR_CHECK=y
 CONFIG_NET_ICMPV4_ACCEPT_BROADCAST=y
-CONFIG_NET_INIT_PRIO=90
 CONFIG_NET_PROMISC_LOG_LEVEL_DBG=y
 CONFIG_NET_PROMISCUOUS_MODE=y
 CONFIG_NET_TEST=y