mbv: use new ninja-based build

mbv/bootloader/bootloader.ld

@@ -0,0 +1,34 @@
+MEMORY
+{
+    BLRAM (rwx) : ORIGIN = 0x00000000, LENGTH = 2048
+}
+
+SECTIONS
+{
+    .text :
+    {
+        KEEP(*(.start))
+
+        *(.text*)
+        *(.rodata*)
+    } > BLRAM
+
+    .bss (NOLOAD) :
+    {
+        _bss_begin = .;
+        *(.bss*)
+        *(COMMON)
+        _bss_end = .;
+    } > BLRAM
+
+    .data :
+    {
+        *(.data*)
+
+        __exidx_start = .;
+        *(.exidx*)
+        __exidx_end = .;
+    } > BLRAM
+
+    _initial_stack_pointer = 2048;
+}