Build: Rename diphda with corstone1000

Diphda platform in TF-M is renamed to corstone1000.
Open CI needs to align with this change.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I036bd931a471b6befb1aa8d05ca58cbc8cff6eb0
diff --git a/tfm_ci_pylib/tfm_build_manager.py b/tfm_ci_pylib/tfm_build_manager.py
index f804fc0..f90aaa3 100644
--- a/tfm_ci_pylib/tfm_build_manager.py
+++ b/tfm_ci_pylib/tfm_build_manager.py
@@ -41,7 +41,7 @@
                "arm/musca_b1/secure_enclave":   "MUSCA_B1_SE",
                "arm/musca_s1":                  "MUSCA_S1",
                "stm/stm32l562e_dk":             "stm32l562e_dk",
-               "arm/diphda":                    "DIPHDA",
+               "arm/corstone1000":              "corstone1000",
                "nxp/lpcxpresso55s69":           "lpcxpresso55s69"}
 
 mapCompiler = {"toolchain_GNUARM.cmake":   "GNUARM",