drm/nouveau/imem/ga10[024]: initial support

Appears to be compatible with NV50 code.
Signed-off-by: NBen Skeggs <bskeggs@redhat.com>

drivers/gpu/drm/nouveau/nvkm/engine/device/base.c

@@ -2658,6 +2658,7 @@ nv170_chipset = {
 	.bios = nvkm_bios_new,
 	.devinit = ga100_devinit_new,
 	.ibus = gm200_ibus_new,
+	.imem = nv50_instmem_new,
 	.mc = ga100_mc_new,
 	.pci = gp100_pci_new,
 };
@@ -2668,6 +2669,7 @@ nv172_chipset = {
 	.bios = nvkm_bios_new,
 	.devinit = ga100_devinit_new,
 	.ibus = gm200_ibus_new,
+	.imem = nv50_instmem_new,
 	.mc = ga100_mc_new,
 	.pci = gp100_pci_new,
 };
@@ -2678,6 +2680,7 @@ nv174_chipset = {
 	.bios = nvkm_bios_new,
 	.devinit = ga100_devinit_new,
 	.ibus = gm200_ibus_new,
+	.imem = nv50_instmem_new,
 	.mc = ga100_mc_new,
 	.pci = gp100_pci_new,
 };