Remove KZM/imx31 platform

The platform was the original verification target of seL4 over 10 years
ago and by now there doesn't appear to be any ways to obtain new
hardware.

Currently, the KZM platform is the only ARMv6 platform and supporting it
requires a few work-arounds for emulating mechanisms that newer hardware
supports. Removing this platform also implies removing armv6 support
soon.

Signed-off-by: Kent McLeod <kent@kry10.com>

tools/hardware.yml

@@ -72,25 +72,12 @@ devices:
     regions:
       - index: 0
         kernel: ARM_LOCAL_PPTR
-  # i.MX AVIC (no Linux docs, used in arch/arm/mach-imx/avic.c)
-  - compatible:
-      - fsl,imx31-avic
-    regions:
-      - index: 0
-        kernel: AVIC_PPTR
-        kernel_size: 0x1000
   # ARM PL310 L2 cache controller (arm/l2c2x0.txt)
   - compatible:
       - arm,pl310-cache
     regions:
       - index: 0
         kernel: L2CC_L2C310_PPTR
-  # i.MX31 L2CC (seL4 only)
-  - compatible:
-      - fsl,imx31-l2cc
-    regions:
-      - index: 0
-        kernel: L2CC_PPTR
   # Exynos multi core timer (timer/samsung,exynos4210-mct.txt)
   # Exynos4412 MCT is separate as we use it for the timer IRQ.
   # Other Exynos platforms use the ARM architecture timer.
@@ -114,11 +101,6 @@ devices:
       - arm,cortex-a9-pmu
     interrupts:
       KERNEL_PMU_IRQ: boot-cpu
-  # i.MX evtmon (no Linux binding, this one is seL4-specific.)
-  - compatible:
-      - fsl,imx31-evtmon
-    interrupts:
-      KERNEL_PMU_IRQ: 0
   # Tegra SMMU (memory-controllers/nvidia,tegra30-mc.txt)
   - compatible:
       - arm,mmu-500
@@ -176,23 +158,6 @@ devices:
     interrupts:
       # IMX6 also has the imx31-gpt.
       KERNEL_TIMER_IRQ: 0
-  # i.MX EPIT (no Linux binding, this is seL4-specific.)
-  - compatible:
-      - fsl,imx31-epit
-    regions:
-      - index: 0
-        kernel: EPIT_PPTR
-        kernel_size: 0x1000
-    interrupts:
-      KERNEL_TIMER_IRQ: 0
-  # i.MX GPT
-  - compatible:
-      - fsl,imx31-gpt
-    regions:
-      - index: 0
-        kernel: TIMER_PPTR
-    interrupts:
-      KERNEL_TIMER_IRQ: 0
   # QCOM Krait timer (timer/qcom,msm-timer.txt)
   - compatible:
       - qcom,kpss-timer
@@ -230,7 +195,6 @@ devices:
       - amlogic,meson-gx-uart
       - arm,pl011
       - brcm,bcm2835-aux-uart
-      - fsl,imx31-uart
       - fsl,imx6q-uart
       - fsl,imx8qxp-lpuart
       - fsl,imx6sx-uart