[baremetal] Add atan2 to baremetal (#101767)

Co-authored-by: Petr Hosek <phosek@google.com>

libc/config/baremetal/arm/entrypoints.txt

diff --git a/libc/config/baremetal/arm/entrypoints.txt b/libc/config/baremetal/arm/entrypoints.txt
index ef145e9..b083745 100644
--- a/libc/config/baremetal/arm/entrypoints.txt
+++ b/libc/config/baremetal/arm/entrypoints.txt
@@ -232,6 +232,7 @@
     libc.src.math.acoshf
     libc.src.math.asinf
     libc.src.math.asinhf
+    libc.src.math.atan2
     libc.src.math.atan2f
     libc.src.math.atanf
     libc.src.math.atanhf

libc/config/baremetal/riscv/entrypoints.txt

diff --git a/libc/config/baremetal/riscv/entrypoints.txt b/libc/config/baremetal/riscv/entrypoints.txt
index be41f9a..8cdbbde 100644
--- a/libc/config/baremetal/riscv/entrypoints.txt
+++ b/libc/config/baremetal/riscv/entrypoints.txt
@@ -228,6 +228,7 @@
     libc.src.math.acoshf
     libc.src.math.asinf
     libc.src.math.asinhf
+    libc.src.math.atan2
     libc.src.math.atan2f
     libc.src.math.atanf
     libc.src.math.atanhf