boards/lm3s6965-ek: Trim qemu-protected to fit the part.

The protected build gives the kernel the first 128 KiB of flash and the
user image the second.  Both halves were full.  The kernel image was
132456 bytes and the user image 130668, which is 1308 bytes more than
the 256 KiB the LM3S6965 has.  The two images overlapped.

Remove from the configuration what QEMU cannot use, and what other
configurations of this board already cover:  MMC/SD over SPI with SSI0,
because the QEMU model has no SSI; semihosting hostfs; the GPIO
interrupt ports, which no driver in this configuration uses; and the
wget example with its web client.

The kernel image is now 124580 bytes and the user image 125500.  Each
half has more than 5 KiB free.

Assisted-by: Claude Code:claude-opus-5
Signed-off-by: Marco Casaroli <marco.casaroli@gmail.com>

boards/arm/tiva/lm3s6965-ek/configs/qemu-protected/defconfig

@@ -16,7 +16,6 @@ CONFIG_ARCH_CHIP_LM3S=y
 CONFIG_ARCH_CHIP_LM=y
 CONFIG_ARCH_STACKDUMP=y
 CONFIG_ARM_MPU=y
-CONFIG_ARM_SEMIHOSTING_HOSTFS=y
 CONFIG_BOARDCTL_ROMDISK=y
 CONFIG_BOARD_LOOPSPERMSEC=4531
 CONFIG_BUILD_PROTECTED=y
@@ -31,17 +30,13 @@ CONFIG_EXAMPLES_HELLO=m
 CONFIG_EXAMPLES_MODULE=y
 CONFIG_EXAMPLES_MODULE_DEVPATH="/dev/ram6"
 CONFIG_EXAMPLES_NETTEST=m
-CONFIG_EXAMPLES_WGET=y
 CONFIG_FS_BINFS=y
-CONFIG_FS_HOSTFS=y
 CONFIG_FS_PROCFS=y
 CONFIG_INIT_ENTRYPOINT="nsh_main"
 CONFIG_LIBC_DLFCN=y
 CONFIG_LIBC_ELF_RELOCATION_BUFFERCOUNT=64
 CONFIG_LIBC_ELF_SYMBOL_CACHECOUNT=64
 CONFIG_LIBC_ENVPATH=y
-CONFIG_MMCSD=y
-CONFIG_MMCSD_SPICLOCK=12500000
 CONFIG_MODULE=y
 CONFIG_NET=y
 CONFIG_NETDB_DNSCLIENT=y
@@ -52,7 +47,6 @@ CONFIG_NETINIT_NOMAC=y
 CONFIG_NETUTILS_NETCAT=y
 CONFIG_NETUTILS_TELNETD=y
 CONFIG_NETUTILS_TFTPC=y
-CONFIG_NETUTILS_WEBCLIENT=y
 CONFIG_NET_BROADCAST=y
 CONFIG_NET_ICMP_SOCKET=y
 CONFIG_NET_MAX_LISTENPORTS=8
@@ -79,7 +73,6 @@ CONFIG_RR_INTERVAL=200
 CONFIG_SCHED_HPWORK=y
 CONFIG_SCHED_WAITPID=y
 CONFIG_SIG_DEFAULT=y
-CONFIG_SPI=y
 CONFIG_STACK_COLORATION=y
 CONFIG_START_DAY=8
 CONFIG_START_MONTH=5
@@ -92,14 +85,6 @@ CONFIG_SYSTEM_PING=y
 CONFIG_TASK_NAME_SIZE=24
 CONFIG_TESTING_OSTEST=y
 CONFIG_TIVA_ETHERNET=y
-CONFIG_TIVA_GPIOA_IRQS=y
-CONFIG_TIVA_GPIOB_IRQS=y
-CONFIG_TIVA_GPIOC_IRQS=y
-CONFIG_TIVA_GPIOD_IRQS=y
-CONFIG_TIVA_GPIOE_IRQS=y
-CONFIG_TIVA_GPIOF_IRQS=y
-CONFIG_TIVA_GPIOG_IRQS=y
-CONFIG_TIVA_SSI0=y
 CONFIG_TIVA_UART0=y
 CONFIG_TIVA_WITH_QEMU=y
 CONFIG_TLS_LOG2_MAXSTACK=11