mb/google/trulo: Keep ISH default enable

This patch drops fw_config probing for ISH because ISH IP should
remains on by default for all Trulo variants.

Additionally, removed the redundant ISH entries from variant
override devicetree.

BUG=b:354607924
TEST=Able to verify ISH PCI Device is available while booting eMMC sku.

```
lspci
00:00.0 Host bridge: Intel Corporation Device 461c
...
00:12.0 Serial controller: Intel Corporation Device 54fc
...
00:1a.0 SD Host controller: Intel Corporation Device 54c4
```

Also, able to enter S0ix with this patch.

```
> suspend_stress_test -c 1 --ignore_s0ix_substates

At AP console:

s0ix errors: 0
s0ix substate errors: 0
s0ix pc10 errors: 0

At EC console:
power state 5 = S0ix, in 0x38d87
```
Change-Id: Ic1e415ec848ac91a9bbf21b26597f4e6b5f7a1f5
Signed-off-by: Subrata Banik <subratabanik@google.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/83695
Reviewed-by: Eric Lai <ericllai@google.com>
Reviewed-by: V Sowmya <v.sowmya@intel.com>
Reviewed-by: Amanda Hwang <amanda_hwang@compal.corp-partner.google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

0 files changed, 0 insertions, 0 deletions