roms/vbootrom: update to 7b1eb5f7fe6a

Changes:

7b1eb5f ast27x0: Fix Makefile to unconditionally set CC to support correct cross-compilation
601d410 ast27x0: Fix missing SCU module reset for SSP and TSP initialization
80768e4 ast27x0: Initialize and enable SSP/TSP using SCU with reserved-memory from DTB
f8ab635 ast27x0: Show build date and git version
53294f5 Add initial support for AST27x0
b1c2803 Dynamically detects NPCM8XX UBOOT destination and size.
4f54dfc Automatically search for UBOOT location for NPCM8xx images.

The actual bootroms are not updated yet.

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Link: https://lore.kernel.org/qemu-devel/2a89ad4c8f5665d07952a4f1749caa6ec0cd3d9c.1753654515.git.mjt@tls.msk.ru
[ clg: Update to latest vbootrom ]
Reviewed-by: Jamin Lin <jamin_lin@aspeedtech.com>
Signed-off-by: Cédric Le Goater <clg@redhat.com>

diff --git a/roms/vbootrom b/roms/vbootrom
index 1287b6e42e839ba2ab0f06268c5b53ae60df3537..183c9ff8056b7946db1ae49cc23e8980ac413174 160000 (submodule)
--- a/roms/vbootrom
+++ b/roms/vbootrom
@@ -1 +1 @@
-Subproject commit 1287b6e42e839ba2ab0f06268c5b53ae60df3537
+Subproject commit 183c9ff8056b7946db1ae49cc23e8980ac413174